Yamaha RAPTOR 250 Service Manual download pdf (Page 148)

ENG

4-32

+

REMOVING THE PISTON

1. Remove:

• Piston pin clips

• Piston pin

•Piston

N

O

TE:N

O

TE:

• Before removing the piston pin clip, cover the

crankcase opening with a clean rag to pre-

vent the piston pin clip from falling into the

crankcase.

• Before removing each piston pin, deburr the

clip groove and pin hole area. If the piston pin

groove is deburred and the piston pin is still

difficult to remove, use the piston pin puller

.

CAUTION:

Do not use a hammer to drive the piston

pin out.

2. Remove:

• Top ring

• 2nd ring

•Oil ring

N

O

TE:N

O

TE:

When removing a piston ring, open the end

gap with your fingers and lift the other side of

the ring over the piston crown.

CHECKING THE CYLINDER AND PISTON

1. Check:

•Piston wall

• Cylinder wall

Vertical scratches → Rebore or replace the

cylinder, and replace the piston and piston

rings as a set.

2. Measure:

• Piston-to-cylinder clearance

Piston pin puller set

90890-01304

Piston pin puller

YU-01304

CYLINDER AND PISTON

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